vue.esm.js?efeb:628 [Vue warn]: Invalid prop: type check failed for prop "defaultActive". Expected String with value "0", got Number with value 0.

vue.esm.js?efeb:628 [Vue warn]: Invalid prop: type check failed for prop "defaultActive". Expected String with value "0", got Number with value 0.

问题解决：active:"0", 0加上双引号即可.

 <el-menu :default-active="navBar.active"

          mode="horizontal"

          @select="handleSelect"

          background-color="#545c64"

          text-color="#fff"

          active-text-color="#ffd04b"

 >

 
data() {
        return {
            navBar:{
                active:0,
            }
        }
    },